Is your truck's temperature gauge acting weird or engine running too hot/cold? Might be the thermostat. This is a brand new, high-quality replacement thermostat housing assembly designed to fit a bunch of popular GM vehicles from 2014 to 2020. We're talking Chevy Silverado 1500/2500, Tahoe, Suburban, GMC Sierra 1500, Yukon, Yukon XL, and Cadillac Escalade with V8 engines like the 5.3L and 6.2L (check the full list to confirm your exact model!). It replaces OEM part numbers like 12674639, 12666569, and 15-11125. A failing thermostat can cause overheating, poor heater performance, or erratic temperature readings. Swapping in this new one can get your engine's cooling system back on track. It's made from premium materials for durability and is designed to meet or exceed the original part's performance. Please note, this is an aftermarket part (not genuine GM) manufactured by DINGTONG, but it's built to the proper specs. Double-check your vehicle's year, make, model, and engine size before ordering to ensure a perfect fit. Comes with one thermostat. Get your engine temperature regulated properly again.